One of the mysteries of the English language finally explained.
(of a dye or pigment) not prone to discolor when exposed to light.
- ‘I was wondering if anyone knows whether its nupastels are lightfast or not.’
- ‘Need the right expert in lightfast dye?’
- ‘The Bisphenol A bischloroformate is then reacted with another chemical to produce a lightfast epoxy resin.’
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